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361. Re: [Amps] Power from Pair of Eimac 4 x 150 a / 7034? (score: 1)
Author: donroden@hiwaay.net
Date: Sun, 28 Dec 2014 16:07:22 -0600
More rugged screen and grid structure for high vibration ( read military ). Don W4DNR And, just to complicate things a bit, the 4CX250R is stated to provide more output than the 4CX250B. I think it i
/archives//html/Amps/2014-12/msg00127.html (11,744 bytes)

362. Re: [Amps] Alpha Input SWR (score: 1)
Author: donroden@hiwaay.net
Date: Fri, 09 Jan 2015 21:40:12 -0600
I am going to sell this 8410 because of that reason. What a piece of junk. 73 HNY to all.... Hardy N7RT $200 autotuner. Don W4DNR _______________________________________________ Amps mailing list Am
/archives//html/Amps/2015-01/msg00014.html (7,970 bytes)

363. Re: [Amps] The genius of ham radio (score: 1)
Author: donroden@hiwaay.net
Date: Mon, 12 Jan 2015 10:24:43 -0600
I agree with Jim and Roger and take slight issue with Alek. My Uncle Earl used to say,"Even a blind squirrel finds a nut once in a while" This expression means that even if people are ineffective or
/archives//html/Amps/2015-01/msg00042.html (9,055 bytes)

364. Re: [Amps] Input SWR revisited (score: 1)
Author: donroden@hiwaay.net
Date: Tue, 13 Jan 2015 14:01:04 -0600
Clear as Mud ......... What does it all mean ??? Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2015-01/msg00095.html (7,767 bytes)

365. Re: [Amps] k9yc pdf (score: 1)
Author: donroden@hiwaay.net
Date: Tue, 13 Jan 2015 18:15:10 -0600
Not really -- what I've tried to do is show what matters, the effects of height and ground on both horizontal and vertical antennas. I just want to know : How high for NAVASSA @ 1400 miles? I worked
/archives//html/Amps/2015-01/msg00102.html (7,854 bytes)

366. Re: [Amps] k9yc pdf (score: 1)
Author: donroden@hiwaay.net
Date: Tue, 13 Jan 2015 20:16:17 -0600
Yep... 146 east of north and 1400 miles away The terrain drops 1000 feet in that direction in the first 1/4 mile. Maybe I'll get em on six... Don W4DNR I worked 2 real ones way back, Wayne Green and
/archives//html/Amps/2015-01/msg00104.html (9,290 bytes)

367. Re: [Amps] Input SWR revisited (score: 1)
Author: donroden@hiwaay.net
Date: Wed, 14 Jan 2015 14:10:12 -0600
Explain the case where a 100 ohm load ( 2:1 ) can be a 1:1 swr at the transmitter with a length of 75 ohm cable. I've changed the cable length and improved the SWR. Don W4DNR It means that-- if you a
/archives//html/Amps/2015-01/msg00108.html (10,085 bytes)

368. Re: [Amps] Input SWR revisited (score: 1)
Author: donroden@hiwaay.net
Date: Wed, 14 Jan 2015 16:08:15 -0600
Yes, and if I add another 1/4 wave of 75 ohm cable to the length, the transmitter is now looking into a 2:1 ( 100 ohm ) Load and will start folding back. So saying : the SWR will always remain the sa
/archives//html/Amps/2015-01/msg00113.html (11,934 bytes)

369. Re: [Amps] Input SWR revisited (score: 1)
Author: donroden@hiwaay.net
Date: Wed, 14 Jan 2015 16:12:37 -0600
But, the swr inside the 75 ohm coax is still 1.333 at all points along the cable. No, not at either end. Why does the swr "inside" the coax even matter when we are discussing load and source impedanc
/archives//html/Amps/2015-01/msg00114.html (8,503 bytes)

370. Re: [Amps] Input SWR revisited (score: 1)
Author: donroden@hiwaay.net
Date: Wed, 14 Jan 2015 16:49:30 -0600
In practice, few of us run amplifier input cables in the multi-quarter wave length category, so spiraling around the Smith is not an option. Just Saying ....... Don W4DNR I suggest a look at this non
/archives//html/Amps/2015-01/msg00116.html (10,969 bytes)

371. Re: [Amps] Input SWR revisited (score: 1)
Author: donroden@hiwaay.net
Date: Wed, 14 Jan 2015 17:20:13 -0600
Gerald, I am not ignorant of transmission line theory. I maintained high power UHF klystrons for many years, and fed kilowatts out of a 50 ohm transmitter into 70 ohm 6 inch lines. Just don't make a
/archives//html/Amps/2015-01/msg00119.html (10,093 bytes)

372. Re: [Amps] Input SWR revisited (score: 1)
Author: donroden@hiwaay.net
Date: Wed, 14 Jan 2015 18:08:27 -0600
Quoting Robert Carroll <w2wg@comcast.net>: The point is if you match the transceiver and make it happy with a particular length of line, the SWR in the line is close to meaningless from a loss standp
/archives//html/Amps/2015-01/msg00122.html (9,275 bytes)

373. [Amps] Amps with high swr question (score: 1)
Author: donroden@hiwaay.net
Date: Wed, 14 Jan 2015 22:19:49 -0600
If someone has an amp that has high input vswr, why not break the path between the amp relay and the input to the tube and insert a 200 watt autotuner ? Between the relay and tube ... not in the rece
/archives//html/Amps/2015-01/msg00127.html (9,818 bytes)

374. Re: [Amps] Amps with high swr question (score: 1)
Author: donroden@hiwaay.net
Date: Thu, 15 Jan 2015 12:05:30 -0600
I am suggesting IN ADDITION to the factory input circuits which. HOPEFULLY offers the needed effect Impedance matching is only one of the functions a tuned input circuit on the input of a GG linear a
/archives//html/Amps/2015-01/msg00132.html (8,651 bytes)

375. Re: [Amps] High Voltage Wire (score: 1)
Author: donroden@hiwaay.net
Date: Mon, 19 Jan 2015 19:38:23 -0600
Used to be sold as "Packard 440"... good HV wire as is neon transformer secondary wire. Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.co
/archives//html/Amps/2015-01/msg00166.html (9,426 bytes)

376. Re: [Amps] Multi-tube vs Single or Dual-tube amps? (score: 1)
Author: donroden@hiwaay.net
Date: Mon, 19 Jan 2015 20:48:26 -0600
It becomes a lot more complex when you start adding tubes. Power supplies, in particular HV Like 800-900 volts @ 1 amp. ( and eight 1646s might not hit 15 meters ) Don W4DNR ________________________
/archives//html/Amps/2015-01/msg00168.html (8,731 bytes)

377. Re: [Amps] Multi-tube vs Single or Dual-tube amps? (score: 1)
Author: donroden@hiwaay.net
Date: Tue, 20 Jan 2015 04:50:23 -0600
IF I recall correctly, the WRL2000 plate impedance was 1000v/2amps or 50 ohms. Don W4DNR I bet you have a much better chance of getting two matching 4-125A tubes than 10 sweep tubes. Hi Hi Hi _______
/archives//html/Amps/2015-01/msg00177.html (9,767 bytes)

378. Re: [Amps] really outrageous amps (score: 1)
Author: donroden@hiwaay.net
Date: Thu, 22 Jan 2015 20:42:33 -0600
Has anyone built up a 3CW20000A7? I have a brandy-new Econco rebuilt 4CX15,000 and socket. Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://list
/archives//html/Amps/2015-01/msg00202.html (7,176 bytes)

379. Re: [Amps] really outrageous amps (score: 1)
Author: donroden@hiwaay.net
Date: Thu, 22 Jan 2015 22:54:04 -0600
Remember when someone said, " I'm using an "L-network" to drive the amp, they were talking about a 30L-1 ? Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.
/archives//html/Amps/2015-01/msg00209.html (7,432 bytes)

380. Re: [Amps] 5 Minutes for Ameritron 811H to warm up? (score: 1)
Author: donroden@hiwaay.net
Date: Sat, 24 Jan 2015 10:38:36 -0600
I just went out and measured a 100 year old pane of glass on my grandfather's shop. No appreciable thickness change from top to bottom. I wouldn't spend to much time watching for glass flow. Don W4DN
/archives//html/Amps/2015-01/msg00250.html (10,103 bytes)

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